Nitrogen Fertility Options for Organic High Tunnels
Cordelia Machanoff, Program Aide
Cornell Vegetable Program

Given the longer season and higher yields of tunnel tomatoes, a nitrogen fertilizer to inject or side-dress will help prevent mid-season deficiencies.
Our recommendations and pre-plant and in-season organic nitrogen sources are provided in the PDF below.
This work is part of a 2-year project between CCE Cornell Vegetable Program and NOFA-NY with support from the New York Farm Viability Institute.
Nitrogen Fertility Options for Organic High Tunnels, May 2017 (pdf; 1094KB)

Upcoming Events
Postharvest Water Management, Sanitation, and Traceability Workshop
March 18, 2026
Albion, NY
Cornell University personnel from the National GAPs Program and the Produce Safety Alliance are presenting a workshop on postharvest water management, sanitation, and traceability. This workshop will include a mix of short talks and hands-on activities to provide attendees with applied experience with sanitation, postharvest water, and traceability topics.
2.75 NYSDEC CEU's in categories 10, 1a, and 23 available.
2026 NYS Dry Bean Meeting and Cutting Event
March 20, 2026
Geneva, NY
The Cutting Event will be held in the morning, followed by lunch, and the NYS Dry Bean Meeting in the afternoon.
DEC recertification credits available for the NYS Dry Bean Meeting portion of the day: 2.0 in categories 1a, 10, 21, and 23.
Harmonized GAP Plus+ Plan Writing Session
March 20, 2026
Newark, NY
Join us for this specialized workshop to cover requirements for this specific audit. Commercial fruit and vegetable growers are increasingly being asked to have the Harmonized GAP Plus+ audit to satisfy some large buyer's requirements.